libext2fs: store checksum seed in superblock

[tools/e2fsprogs.git] / lib / ext2fs / ext2_fs.h

diff --git a/lib/ext2fs/ext2_fs.h b/lib/ext2fs/ext2_fs.h
index d16dd80..cdb68e8 100644 (file)
--- a/lib/ext2fs/ext2_fs.h
+++ b/lib/ext2fs/ext2_fs.h
@@ -727,7 +727,8 @@ struct ext2_super_block {
        __u8    s_encrypt_pw_salt[16];  /* Salt used for string2key algorithm */
        __le32  s_lpf_ino;              /* Location of the lost+found inode */
        __le32  s_prj_quota_inum;       /* inode for tracking project quota */
-       __le32  s_reserved[99];         /* Padding to the end of the block */
+       __le32  s_checksum_seed;        /* crc32c(orig_uuid) if csum_seed set */
+       __le32  s_reserved[98];         /* Padding to the end of the block */
        __u32   s_checksum;             /* crc32c(superblock) */
 };
 
@@ -813,7 +814,7 @@ struct ext2_super_block {
 #define EXT4_FEATURE_INCOMPAT_FLEX_BG          0x0200
 #define EXT4_FEATURE_INCOMPAT_EA_INODE         0x0400
 #define EXT4_FEATURE_INCOMPAT_DIRDATA          0x1000
-/* 0x2000 was EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM but this was never used */
+#define EXT4_FEATURE_INCOMPAT_CSUM_SEED                0x2000
 #define EXT4_FEATURE_INCOMPAT_LARGEDIR         0x4000 /* >2GB or 3-lvl htree */
 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA      0x8000 /* data in inode */
 #define EXT4_FEATURE_INCOMPAT_ENCRYPT          0x10000
@@ -904,6 +905,7 @@ EXT4_FEATURE_INCOMPAT_FUNCS(mmp,            4, MMP)
 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg,           4, FLEX_BG)
 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode,          4, EA_INODE)
 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata,           4, DIRDATA)
+EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed,         4, CSUM_SEED)
 EXT4_FEATURE_INCOMPAT_FUNCS(largedir,          4, LARGEDIR)
 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data,       4, INLINE_DATA)
 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt,           4, ENCRYPT)